package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 判断当前加入到购物车中的数据是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long useId = BaseContext.getCurrentId();
        shoppingCart.setUserId(useId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 如果存在了，只需要将数量加 1
        if(list != null && !list.isEmpty()){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            // 执行更新语句：update shopping_cart set number = ? where id = ?
            shoppingCartMapper.updateNumberById(cart);
        } else {
            // 如果不存在，需要插入一条购物车数据
            Long dishId = shoppingCart.getDishId();
            // 如果商品是菜品，查询菜品表
            if(dishId != null) {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            // 如果商品是套餐，查询套餐表
            else {
                Long setmealId = shoppingCart.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            // 设置商品数量和创建时间
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        // 获取到当前微信用户id
        Long userId = BaseContext.getCurrentId();
//        ShoppingCart cart = new ShoppingCart();
//        cart.setUserId(userId);
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        // 查询购物车表
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        // 获取到当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long useId = BaseContext.getCurrentId();
        shoppingCart.setUserId(useId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        ShoppingCart cart = list.get(0);
        //如果只有一件，直接在购物车里面删掉
        if(cart.getNumber()==1){
            shoppingCartMapper.deleteShopping(cart);
            //delect * form shopping_cart where user_id = ? dish_id  stemeal_id
        }
        //多件，减一
        else{
            cart.setNumber(cart.getNumber() - 1);
            // 执行更新语句：update shopping_cart set number = ? where id = ?
            shoppingCartMapper.updateNumberById(cart);
        }



    }


}
